Rotating electric machine

Abstract

A rotating electric machine, comprising: a first accommodation part that accommodates a rotor and a stator which has a stator core and a coil and which has a liquid medium supplied thereinto; and a second accommodation part that accommodates a thermistor. A partition wall that includes a hole penetrated by a conductor is provided between the first accommodation part and the second accommodation part. One end of the conductor is electrically connected to the coil. The other end of the conductor is electrically connected to the thermistor. A seal part is provided to the hole.

Description

Rotating electrical machine

[0001] The present invention relates to a rotating electrical machine.

[0002] Patent Document 1 below discloses a configuration in which a rotor and a stator are arranged in a rotating electrical machine, and a thermistor is arranged in a first accommodating portion of a housing.

[0003] Japanese Patent Application Laid-Open No. 2011-30288

[0004] In view of the configuration described in Patent Document 1, an object of the present invention is to provide a rotating electrical machine that realizes improved detection accuracy, reduced temperature measurement error, and stable continuous torque output.

[0005] A rotating electrical machine including a rotor, a stator having a stator core and a coil, a first accommodating portion that accommodates them and in which a liquid medium is supplied, and a second accommodating portion that accommodates a thermistor, wherein a partition wall having a hole through which a conductor passes is provided between the first accommodating portion and the second accommodating portion, one end of the conductor is electrically connected to the coil, the other end of the conductor is electrically connected to the thermistor, and a seal portion is provided in the hole.

[0006] It is possible to provide a rotating electrical machine that realizes improved detection accuracy, reduced temperature measurement error, and stable continuous torque output.

[0007] A diagram for explaining the configuration of a rotating electrical machine according to an embodiment of the present invention. A diagram for explaining the configuration of a second accommodating portion provided on the axial direction side of the rotation axis of the rotor according to an embodiment of the present invention. A diagram for explaining the configuration of a second accommodating portion provided on the radial direction side of the rotor according to an embodiment of the present invention.

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description and drawings are examples for explaining the present invention, and for clarity of explanation, appropriate omissions and simplifications are made. The present invention can be implemented in various other forms. Unless otherwise particularly limited, each component may be singular or plural.

[0009] The positions, sizes, shapes, and ranges of the components shown in the drawings may not represent their actual positions, sizes, shapes, and ranges in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the positions, sizes, shapes, and ranges disclosed in the drawings.

[0010] (One Embodiment and Overall Configuration) (Figure 1) The rotating electric machine 1 has a housing 2 and a housing cover 2a. The housing 2 has a first housing section 11 and a second housing section 12a. The housing cover 2a has a second housing section 12b. The stator 3 and rotor 4 are housed in the first housing section 11, and when the housing cover 2a is assembled to the housing 2, the internal space of the first housing section 11 becomes independent from the external space of the rotating electric machine 1. In the rotating electric machine 1, the second housing section 12a is provided so as to face the stator 3 in the radial direction of the rotor 4, and the second housing section 12b is provided so as to face the stator 3 and rotor 4 in the axial direction of the rotor's rotation axis.

[0011] The rotor 4 has a stator core 3a and a coil 5. The stator core 3a has slots (not shown) through which the coil 5 is inserted. The coil 5 includes a slot conductor (not shown) inserted into the stator core 3a and a coil end exposed to the outside of the stator core 3a. In the first housing 11, the stator 3 and the rotor 4 are arranged with a predetermined gap between them. As the rotor 4 rotates, rotational convection 16 is generated in the first housing 11.

[0012] In the stator 3 within the first housing section 11, the area around the coil end of the coil 5 is covered by a coil end cover 5a. This forms a coil end oil passage 5b inside the coil end cover 5a. Cooling oil 13, which is a liquid coolant, is supplied to the inside of the coil end oil passage 5b from outside the housing 2 by a pump (not shown) or the like. The coil end oil passage 5b cools the coil 5, which is inserted into the slot of the stator core 3a, by circulating the cooling oil 13. The cooling oil 13 that has circulated through the coil end oil passage 5b is discharged to the outside from an outlet (not shown) of the housing 2.

[0013] The second housing sections 12a and 12b each house the thermistor 9 shown in Figure 1(b), thereby functioning as coil temperature detection sections for the rotating electric machine 1. The coil 5 is electrically connected to the conductor 6 at the coil end. The conductor 6 includes a busbar for supplying power from a power conversion device (not shown) to the coil 5 of the stator 3.

[0014] Partition walls 7, which are part of the housing 2 and housing cover 2a, are provided between the first housing section 11 and the second housing section 12a, and between the first housing section 11 and the second housing section 12b, respectively. The partition walls 7 are provided with holes 8 for the conductor 6 to pass through. The second housing sections 12a and 12b are provided in the housing 2 and housing cover 2a, respectively, at a predetermined distance 15 from the coil end oil passage 5b.

[0015] This configuration allows for temperature separation between the coil end oil passage 5b, which is the space for cooling the coil 5 with cooling oil 13, and the second housing sections 12a and 12b, which are spaces for detecting the temperature of the coil 5. In other words, the thermistors 9 housed in the second housing sections 12a and 12b are less affected by the cooling temperature of the cooling oil 13 flowing in the coil end oil passage 5b, thereby improving the accuracy of temperature detection of the coil 5 and reducing temperature measurement errors.

[0016] The conductor 6 penetrates the hole 8 in the partition wall 7. One end of the conductor 6 is electrically connected to the lead wire 5c of the coil end of the coil 5 (shown in Figures 2 and 3), and the other end is electrically connected to the thermistor 9 in the second housing sections 12a and 12b. As shown in Figure 1(b), the thermistor 9 and the conductor 6 are covered with a fixing material 9a that has high thermal and electrical conductivity. The fixing material 9a can be any metallic material, such as Cu, SUS (Steel Use Stainless), or an aluminum plate. With this configuration, the thermistor 9 detects the temperature of the coil 5.

[0017] A resolver (not shown), which is a rotation angle sensor for detecting the rotation angle of the rotor 4, is provided inside the first housing section 11. The resolver is coated with resin or the like, which prevents false detections due to oil adhesion, etc.

[0018] (Figure 2) Figure 2 is a diagram illustrating the configuration of the second housing section 12b, but the housing cover 2a (partition wall 7) is not shown. The conductor 6 is electrically connected to the lead wires 5c of the coil 5, thereby electrically connecting to the neutral points of the three phases of the coil 5: U-phase, V-phase, and W-phase.

[0019] The conductor 6 is covered by the conductor cover 6a by passing through it. The conductor cover 6a is provided in the hole 8 (Figure 1) and is made of, for example, an insulating material. The conductor 6 and the conductor cover 6a pass through the hole 8 in the partition wall 7, but a sealing portion 10 is provided between the conductor cover 6a and the hole 8. As a result, the inner wall surface of the hole 8 and the conductor cover 6a are in close contact with each other by the sealing portion 10, so that the first housing portion 11 and the second housing portion 12b shown in Figure 1 function as independent spaces. Furthermore, with this configuration, the second housing portion 12b is not affected by the rotational convection 16 or cooling oil 13 generated in the first housing portion 11, so the accuracy of temperature detection of the coil 5 of the thermistor 9 housed in the second housing portion 12b is improved and the temperature measurement error can be reduced. This enables stable temperature protection control of components in the rotating electric machine 1.

[0020] The sealing portion 10 is formed from an elastic rubber material or the like. The sealing portion 10 may be formed integrally with the conductive cover 6a, or it may be a separate component from the conductive cover 6a. If the sealing portion 10 and the conductive cover 6a are formed integrally, the sealing portion 10 and the conductive cover 6a are formed integrally from a rubber material or the like.

[0021] (Figure 3) Figure 3 is a diagram illustrating the configuration of the second housing section 12a. Note that the housing cover 2a constituting the second housing section 12a is omitted from the illustration. Furthermore, the configuration of the second housing section 12a is the same as the configuration of the second housing section 12b described in Figure 2 above. Therefore, the second housing section 12a, like the second housing section 12b, is not affected by the rotational convection 16 or cooling oil 13 generated in the first housing section 11, thus improving the detection accuracy of the temperature of the coil 5 of the thermistor 9 housed in the second housing section 12a and reducing the temperature measurement error.

[0022] The resolver, which is the aforementioned rotation angle sensor, has signal wiring that extends toward the second housing section 12a. This signal wiring extends from the first housing section 11 to the second housing section 12a, similar to the conductor 6. The second housing section 12a is also provided with a relay connector 18 for electrical connection to external electrical components of the rotating electric machine 1. Within the second housing section 12a, the connector of the signal wiring extending from the resolver and the connector of the signal wiring of the thermistor 9 are electrically connected to the relay connector 18. In Figure 3, these two connectors are shown together as a connection connector 19.

[0023] The two signal wiring connectors 19 mentioned above are electrically connected to the relay connector 18 from the same direction. This eliminates the need to change the installation position of the relay connector 18 in the second housing section 12a to match the connectors of each signal wiring, and also eliminates the need to change the shape of the second housing section 12a according to the wiring connections. Although Figure 3 shows the relay connector 18 being provided in the second housing section 12a, the relay connector 18 may also be provided in the second housing section 12b, and the two signal wiring connectors 19 may be electrically connected to the relay connector 18 from the same direction.

[0024] The embodiments of the present invention will now be described in comparison with conventional configurations. Conventionally, for example, one could consider insulating the first housing section 11 and the second housing section 12 using an insulating material such as wool. However, even if the influence of the thermistor can be reduced in this case, such insulating materials have the problem of being susceptible to humidity. Furthermore, even if heat shielding performance is considered using resin or the like, there is the problem that the thickness of the resin needs to be increased. In contrast, with the present invention, the thermistor 9 can obtain stable measurement results without using these insulating materials, and can contribute not only to improving detection accuracy and reducing temperature measurement errors, but also to realizing a stable continuous torque output of the rotating electric machine 1.

[0025] It should be noted that the present invention is not limited to the embodiments described above, and various modifications and combinations of other configurations can be made without departing from the spirit of the invention. Furthermore, the present invention is not limited to having all the configurations described in the embodiments described above, and may also include configurations in which some of those configurations are omitted.

[0026] 1 Rotating electric machine 2 Housing 2a Housing cover 3 Stator 3a Stator core 4 Rotor 5 Coil 5a Coil end cover 5b Coil end oil passage 5c Lead wire 6 Conductor 6a Conductor cover 7 Partition 8 Hole 9 Thermistor 9a Fixing material 10 Seal part 11 First housing part 12 Second housing part 12a Second housing part (radial side) 12b Second housing part (axial side) 13 Cooling oil 15 Determined distance 16 Rotational convection 18 Intermediate connector 19 Connection connector

Claims

1. A rotating electric machine comprising: a first housing section that houses a rotor and a stator having a stator core and coils, and into which a liquid medium is supplied; and a second housing section that houses a thermistor, wherein a partition wall is provided between the first housing section and the second housing section, the partition wall having a hole through which a conductor passes, one end of the conductor is electrically connected to the coil, the other end of the conductor is electrically connected to the thermistor, and a seal portion is provided in the hole.

2. A rotating electric machine according to claim 1, wherein the conductor is electrically connected to the lead wire of the coil.

3. A rotating electric machine according to claim 1, wherein the conductor is electrically connected to the neutral point of the coil.

4. A rotating electric machine according to claim 1, wherein the conductor covered by a cover passes through the hole, and the sealing portion is provided between the hole and the cover.

5. A rotating electric machine according to claim 4, wherein the sealing portion is formed integrally with the cover.

6. A rotating electric machine according to claim 4, wherein the sealing portion is separate from the cover.

7. The rotating electric machine according to claim 4, wherein the conductor includes a busbar that supplies power to the stator, and the busbar rotates through the cover.

8. A rotating electric machine according to claim 1, wherein the second housing is provided so as to face the rotor and the stator in the axial direction of the rotor's rotation shaft.

9. A rotating electric machine according to claim 1, wherein the second housing is provided so as to face the stator in the radial direction of the rotor.

10. A rotating electric machine according to claim 1, wherein the first housing is provided with a rotation angle sensor for detecting the rotation angle of the rotor, the second housing is provided with a relay connector, and the connector provided on the signal wiring of the rotation angle sensor and the connector provided on the signal wiring of the thermistor are electrically connected to the relay connector from the same direction.

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